I also need the Northern Mariana from Denver, but my other missing one is the Washington DC from Phily. I only need one National Park from 2010, but still half from 2011 and have found only 2 from 2012 and one from 2013!
Incidentally, I am replying to the post by ikaros, I keep hitting the quote button below the post, but it does not show up in my post. Anyone know why this is?